A message stuck in the Outbox can stop a workday surprisingly quickly. If your email not sending messages problem has appeared without warning, the cause may be as simple as a dropped internet connection or a full mailbox. It can also point to an account setting, security prompt or provider issue that needs a closer look.
The useful thing is that most sending problems leave clues. Start with the simple checks first, avoid repeatedly pressing Send, and work through the problem in a sensible order. That gives you the best chance of getting email working again without losing an important message.
Start with the message itself
Before changing settings, check whether the problem affects every email or only one particular message. Try sending a short test email to yourself with a simple subject line and no attachment. If that sends, your account is probably working and the original message is likely the issue.
Large attachments are a common cause. Photos from a mobile, scanned PDFs and video files can easily exceed the limit set by your email provider or the recipient’s provider. The message may remain in the Outbox, display an error, or appear to send before later returning as undeliverable.
Remove the attachment and try again. If the email needs to include files, reduce their size, send fewer files in separate messages, or use an approved file-sharing method. Also check the recipient’s address carefully. One missing character, an extra space, or an old business address can prevent delivery.
Check your internet connection
Email needs a stable internet connection to leave your device. A web page loading does not always mean the connection is strong enough, particularly if you are using weak Wi-Fi or mobile data.
Try opening a few different websites, then send a test email. If pages are slow or fail to load, restart your modem or router and reconnect your computer or mobile to the network. For remote workers and small businesses, it is worth checking whether other devices are also having trouble. If they are, the email app is unlikely to be the real cause.
If you use email software such as Outlook, make sure it is not set to work offline. In Outlook, this can make messages sit in the Outbox even though everything looks normal at first glance. Turn off offline mode, wait for the account to reconnect, then try sending the test message again.
Make sure your mailbox is not full
A full mailbox can affect sending as well as receiving. This catches people out because they may focus on the Outbox, when the account has simply run out of storage.
Sign in to your email through a web browser and look for a storage warning. Delete emails you no longer need, especially those with large attachments, then empty the Deleted Items or Trash folder. Many email services keep deleted messages in storage until that folder is cleared.
Be careful with business records, invoices and important correspondence. Rather than deleting everything in a hurry, save essential messages or attachments in an organised folder on your computer or approved cloud storage first. If you are unsure what is safe to remove, getting help before clearing a mailbox is often the safer option.
Look for password and security prompts
Email providers regularly update their security checks. A saved password that worked last week may no longer be accepted after a password change, a software update, or an unusual sign-in attempt.
Open your email app and look for any prompt asking you to sign in again, verify your identity, or enter an updated password. It is easy to miss these messages, particularly in a desktop app that opens automatically. If you have recently changed your password online, update it on every device that uses the account.
Two-factor authentication can also affect older email programs and devices. Some providers require a modern sign-in method, while others may need a separate app password for older software. Do not keep guessing passwords, as repeated attempts can temporarily lock the account. Instead, confirm that you can sign in to webmail first, then update the device settings carefully.
Check outgoing mail settings
When incoming email works but nothing sends, the outgoing mail settings are a likely culprit. Email uses separate settings for receiving and sending, so one side can work while the other fails.
This often happens after changing internet providers, moving an email account to a new computer, replacing a modem, or setting up an account manually on a new mobile. The outgoing server name, port number, encryption option and authentication settings must match what your email provider requires.
Avoid copying random settings from an online forum. Providers use different configurations, and old advice can create more confusion. If you have the correct details from your provider, compare them carefully with the settings in your app. In many cases, removing the account and adding it again through the provider’s standard sign-in option is cleaner than editing several settings one by one. Only do this if you know the account password and are confident any locally stored mail is backed up.
Test webmail to narrow down the cause
One of the quickest ways to work out where the fault sits is to send an email through webmail. This means signing in through your provider’s website in a browser rather than using Outlook, Apple Mail or another app.
If webmail can send messages but your usual app cannot, the issue is probably on that device. It could be an incorrect setting, a damaged mail profile, outdated software or a security program interfering with email.
If webmail cannot send either, the problem is more likely related to the account, storage limit, provider service, or recipient address. Check for any notice from the provider and try sending to a different address. This simple comparison saves time and prevents unnecessary changes to your computer.
Consider antivirus, VPN and software updates
Security software can occasionally scan outgoing email so aggressively that it delays or blocks sending. A VPN can also cause an email provider to treat a sign-in as unusual, especially if the connection appears to be from another country.
Do not permanently turn off security software to make email work. Instead, check whether the software has an email scanning feature, whether it is up to date, and whether it has displayed a warning. If you use a VPN, briefly disconnect it and test email again. If sending resumes, review the VPN settings or contact the provider for advice.
Outdated email apps can cause similar problems. Install pending updates for your operating system and email software, then restart the device. Updates are not a guaranteed fix, but they can resolve compatibility and security issues that stop an account connecting properly.
When the issue needs hands-on support
It is time to get help when messages keep returning to the Outbox, the account repeatedly asks for a password, you cannot access webmail, or you are dealing with important business correspondence. The same applies if multiple staff accounts have stopped sending, as that may involve a domain, internet or provider-level issue.
For households and small businesses, the best solution depends on how the email is set up. A personal Gmail or Outlook.com account is handled differently from an email address connected to a business domain. The goal is not just to force one message through, but to make sure the account is secure, correctly configured and reliable on the devices you use every day.
Tech Experts can troubleshoot email problems remotely or at your location across Wellington, Hutt Valley and Porirua, including checking account access, mail settings, internet connectivity and device configuration. This can be especially helpful when email is linked to printers, calendars, contacts or business software and a quick fix risks creating another problem.
Keep any error message or screenshot you see, and note whether the problem occurs on webmail, your computer, or your mobile. Those small details can turn a frustrating email fault into a straightforward repair – and get your next important message on its way.